3v4l.org

run code in 300+ PHP versions simultaneously
<?php $matches = []; $str = 'fooxbarx'; preg_match('/(^|\\s)x/mu', $str, $matches, PREG_OFFSET_CAPTURE, 0); var_dump($str); var_dump($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LAiKJ
function name:  (null)
number of ops:  16
compiled vars:  !0 = $matches, !1 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    3     1        ASSIGN                                                   !1, 'fooxbarx'
    4     2        INIT_FCALL                                               'preg_match'
          3        SEND_VAL                                                 '%2F%28%5E%7C%5Cs%29x%2Fmu'
          4        SEND_VAR                                                 !1
          5        SEND_REF                                                 !0
          6        SEND_VAL                                                 256
          7        SEND_VAL                                                 0
          8        DO_ICALL                                                 
    5     9        INIT_FCALL                                               'var_dump'
         10        SEND_VAR                                                 !1
         11        DO_ICALL                                                 
    6    12        INIT_FCALL                                               'var_dump'
         13        SEND_VAR                                                 !0
         14        DO_ICALL                                                 
         15      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
157.54 ms | 1385 KiB | 17 Q